Medicinal alcohol is an aqueous solution of $C_{2} H_{6} O$ that contains half alcohol and half water by volume. If this contains 44.29 % alcohol by mass, the density of pure alcohol is about

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$0.795 g / mL$

$0.895 g / mL$

$0.443 g / mL$

$0.557 g / mL$

answer is A.

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Detailed Solution

The mass of water per 100 g of medicinal alcohol is 55.71 g. Its volume will be $55.71 {cm}^{3}$ . Thus, density of alcohol $= 44.29 g / 55.71 {cm}^{3} = 0.795 g {cm}^{- 3}$

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